Autonomous driving system

1. An autonomous driving system mounted on a vehicle and comprising: a vehicle behavior control device configured to perform vehicle behavior control that controls behavior of the vehicle; and an awareness level calculation device configured to calculate an awareness level of a driver of the vehicle, a low awareness state being a state where the awareness level is lower than a normal state, wherein the vehicle behavior control device performs the vehicle behavior control such that another vehicle around the vehicle predicts or recognizes the behavior of the vehicle more easily in a case of the low awareness state than in a case of the normal state, wherein the vehicle behavior control device performs the vehicle behavior control such that said another vehicle predicts or recognizes a lane change of the vehicle more easily in the case of the low awareness state than in the case of the normal state, wherein the vehicle behavior control device performs steering control such that the vehicle moves to an adjacent lane beyond a lane boundary during the lane change, a lane boundary distance is a distance between the vehicle before starting the steering control and the lane boundary, and the vehicle behavior control device sets the lane boundary distance in the case of the low awareness state to be smaller than that in the case of the normal state.

2. The autonomous driving system according to claim 1 , wherein a target acceleration or deceleration is a target value of an acceleration or deceleration of the vehicle in the vehicle behavior control, and the vehicle behavior control device sets the target acceleration or deceleration in the case of the low awareness state to be lower than that in the case of the normal state.

3. The autonomous driving system according to claim 1 , wherein a deceleration start position is a position to start deceleration of the vehicle, and the vehicle behavior control device sets the deceleration start position in the case of the low awareness state to be in front of that in the case of the normal state.

4. The autonomous driving system according to claim 1 , wherein a lane change time is a target time from start to completion of the lane change, and the vehicle behavior control device increases the lane change time in the case of the low awareness state as compared with the case of the normal state.

5. The autonomous driving system according to claim 1 , wherein the lane change includes turn signal flashing, and the vehicle behavior control device increases a duration or a continuation range of the turn signal flashing in the case of the low awareness state as compared with the case of the normal state.